Supercapacitor Overvoltage Protection via Dynamic Group Switching
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Solution Overview
Problem
Supercapacitor systems in electric vehicles face reduced lifespan and potential failure due to variations in leakage currents across unit cells, leading to voltage imbalances and overvoltage issues, which can be exacerbated by factors like charging voltage, temperature, and material differences.
Innovation Solution
A system comprising multiple supercapacitor groups and overvoltage protector units, each with a controller that detects voltage and determines which groups to connect to the vehicle based on data from overvoltage protector units, ensuring balanced voltage and preventing overvoltage through dynamic switching and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple supercapacitors are connected in series for higher voltage applications, then the voltage capability is improved, but voltage imbalances and overvoltage issues occur due to leakage current variations
Solution Approach 1:
The supercapacitor system is divided into multiple independently monitorable unit cells, each equipped with individual overvoltage protection circuitry. This segmentation allows separate monitoring and protection of each cell, preventing voltage imbalances from affecting the entire system.
Solution Approach 2:
The system continuously monitors the voltage of each supercapacitor unit cell through overvoltage protector units and provides feedback to the control system. When voltage imbalances or overvoltage conditions are detected, the control system adjusts the operation to maintain voltage balance and prevent failure.
2Duration of action of stationary object
If individual supercapacitor unit cells are monitored and managed separately, then the lifespan is extended by preventing overvoltage, but the device complexity increases
Solution Approach 1:
The control system performs multiple functions including voltage monitoring, overvoltage detection, balance management, and switching control within a single integrated unit. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing complexity while extending lifespan through comprehensive monitoring.
3Reliability
If dynamic switching between supercapacitor groups is implemented, then overvoltage protection is improved, but the control system complexity increases
Solution Approach 1:
The system dynamically switches between different supercapacitor groups based on real-time voltage conditions and charge states. This dynamic reconfiguration allows the system to adapt to changing conditions, providing robust overvoltage protection while optimizing performance through flexible group management.
Data Source
AI summary
Disclosed herein are systems and methods for overvoltage protection. A system, such as a vehicle, for overvoltage protection of a supercapacitor system for an electric vehicle, the system includes a plurality of supercapacitor groups, each supercapacitor group comprising two or more of the plurality of supercapacitors. The system includes a plurality of overvoltage protector units, each the plurality of overvoltage protector units operable to detect the voltage of each of the two or more supercapacitors within the respective one of the supercapacitor groups. The system includes a controller comprising a processor with access to a memory, wherein the control system is operable to determine which of the plurality of supercapacitor groups to connect to the electric vehicle based on data sent from the respective overvoltage protector units.